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<span id="Enabling-OpenACC"></span><div class="header">
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<hr>
<span id="Enabling-OpenACC-1"></span><h2 class="chapter">5 Enabling OpenACC</h2>

<p>To activate the OpenACC extensions for C/C++ and Fortran, the compile-time 
flag <samp>-fopenacc</samp> must be specified.  This enables the OpenACC directive
<code>#pragma acc</code> in C/C++ and <code>!$acc</code> directives in free form,
<code>c$acc</code>, <code>*$acc</code> and <code>!$acc</code> directives in fixed form,
<code>!$</code> conditional compilation sentinels in free form and <code>c$</code>,
<code>*$</code> and <code>!$</code> sentinels in fixed form, for Fortran.  The flag also
arranges for automatic linking of the OpenACC runtime library 
(<a href="OpenACC-Runtime-Library-Routines.html">OpenACC Runtime Library Routines</a>).
</p>
<p>See <a href="https://gcc.gnu.org/wiki/OpenACC">https://gcc.gnu.org/wiki/OpenACC</a> for more information.
</p>
<p>A complete description of all OpenACC directives accepted may be found in 
the <a href="https://www.openacc.org">OpenACC</a> Application Programming
Interface manual, version 2.6.
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